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參數(shù)資料
| 型號： | MAX1540A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator |
| 中文描述： | 雙路、降壓型控制器，帶有電感飽和保護(hù)、動態(tài)輸出和線性穩(wěn)壓器 |
| 文件頁數(shù)： | 16/49頁 |
| 文件大小： | 794K |
| 代理商： | MAX1540A |
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M
Dual Step-Down Controllers with Saturation
Protection, Dynamic Output, and Linear Regulator
16
______________________________________________________________________________________
PIN
MAX1540A
MAX1541
NAME
FUNCTION
1
1
OVP/UVP
Overvoltage/Undervoltage Protection and Discharge-Mode Control Input. This four-
level logic input selects between various output fault-protection options (Table 7) by
selectively enabling OVP protection and UVP protection. When enabled, the OVP limit
defaults at 116% of the nominal output voltage, and the UVP limit defaults at 70% of
the nominal output voltage. Discharge mode is enabled when OVP protection is also
enabled. Connect OVP/UVP to the following pins for the desired function:
V
CC
= enable OVP and discharge mode, enable UVP.
Open = enable OVP and discharge mode, disable UVP.
REF = disable OVP and discharge mode, enable UVP.
GND = disable OVP and discharge mode, disable UVP.
See the
Fault Protection
and
(ON_)
sections.
Pulse-Skipping Control Input. This four-level logic input enables or disables the light-
load pulse-skipping operation of each output:
V
CC
= OUT1 and OUT2 in forced-PWM mode.
Open = OUT1 in forced-PWM mode, OUT2 in pulse-skipping mode.
REF = OUT1 in pulse-skipping mode, OUT2 in forced-PWM mode.
GND = OUT1 and OUT2 in pulse-skipping mode.
Inductor-Saturation Control Input. This four-level logic input sets the inductor-current
saturation limit as a multiple of the valley current-limit threshold set by ILIM, or
disables the function if not required. Connect LSAT to the following pins to set the
saturation current limit:
V
CC
= 2 x I
LIM(VAL)
Open = 1.75 x I
LIM(VAL)
REF = 1.5 x I
LIM(VAL)
GND = disable LSAT protection
See the
Inductor Saturation Limit
and
Setting the Current Limit
sections.
On-Time Selection Control Input. This four-level logic input sets the K-factor value
used to determine the DH_ on-time (see the
On-Time One-Shot (TON)
section).
Connect to analog ground (GND), REF, or V
CC
; or leave TON unconnected to select
the following nominal switching frequencies:
V
CC
= 235kHz (OUT1) / 170kHz (OUT2)
Open = 345kHz (OUT1) / 255kHz (OUT2)
REF = 485kHz (OUT1) / 355kHz (OUT2)
GND = 620kHz (OUT1) / 460kHz (OUT2)
2
2
SKIP
3
3
LSAT
4
4
TON
5
5
V
CC
Analog Supply Input. Connect to the system supply voltage (+4.5V to +5.5V) through
a series 20
Ω
resistor. Bypass V
CC
to analog ground with a 1μF or greater ceramic
capacitor.
—
6
GATE
Buffered N-Channel MOSFET Gate Input. A logic low on GATE turns off the internal
MOSFET so OD appears as high impedance. A logic high on GATE turns on the
internal MOSFET, pulling OD to ground.
—
7
CC1
Integrator Capacitor Connection for Controller 1. Connect a 47pF to 470pF (47pF typ)
capacitor from CC1 to analog ground (GND) to set the integration time constant for
the main MAX1541 controller (OUT1).
Pin Description
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MAX1540AETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540AETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr w/Saturation Prot RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540ETJ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540ETJ+ | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1540ETJ+T | 功能描述:DC/DC 開關(guān)控制器 Dual Step-Down Ctlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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